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FFmpeg/libavformat/adtsenc.c
Andreas Rheinhardt 03b04eef72 avformat: Enforce one-stream limit where appropriate
Several muxers (e.g. pcm muxers) did not check the number
of streams even though the individual streams were not
recoverable from the muxed files. This commit changes
this by using the FF_OFMT_MAX_ONE_OF_EACH flag
where appropriate.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-22 23:57:19 +01:00

253 lines
8.0 KiB
C

/*
* ADTS muxer.
* Copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@smartjog.com>
* Mans Rullgard <mans@mansr.com>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavcodec/get_bits.h"
#include "libavcodec/put_bits.h"
#include "libavcodec/codec_id.h"
#include "libavcodec/codec_par.h"
#include "libavcodec/packet.h"
#include "libavcodec/mpeg4audio.h"
#include "libavcodec/mpeg4audio_copy_pce.h"
#include "libavutil/opt.h"
#include "avformat.h"
#include "apetag.h"
#include "id3v2.h"
#include "mux.h"
#define ADTS_HEADER_SIZE 7
typedef struct ADTSContext {
AVClass *class;
int write_adts;
int objecttype;
int sample_rate_index;
int channel_conf;
int pce_size;
int apetag;
int id3v2tag;
int mpeg_id;
uint8_t pce_data[MAX_PCE_SIZE];
} ADTSContext;
#define ADTS_MAX_FRAME_BYTES ((1 << 14) - 1)
static int adts_decode_extradata(AVFormatContext *s, ADTSContext *adts, const uint8_t *buf, int size)
{
GetBitContext gb;
PutBitContext pb;
MPEG4AudioConfig m4ac;
int off, ret;
ret = init_get_bits8(&gb, buf, size);
if (ret < 0)
return ret;
off = avpriv_mpeg4audio_get_config2(&m4ac, buf, size, 1, s);
if (off < 0)
return off;
skip_bits_long(&gb, off);
adts->objecttype = m4ac.object_type - 1;
adts->sample_rate_index = m4ac.sampling_index;
adts->channel_conf = m4ac.chan_config;
if (adts->objecttype > 3U) {
av_log(s, AV_LOG_ERROR, "MPEG-4 AOT %d is not allowed in ADTS\n", adts->objecttype+1);
return AVERROR_INVALIDDATA;
}
if (adts->sample_rate_index == 15) {
av_log(s, AV_LOG_ERROR, "Escape sample rate index illegal in ADTS\n");
return AVERROR_INVALIDDATA;
}
if (get_bits(&gb, 1)) {
av_log(s, AV_LOG_ERROR, "960/120 MDCT window is not allowed in ADTS\n");
return AVERROR_INVALIDDATA;
}
if (get_bits(&gb, 1)) {
av_log(s, AV_LOG_ERROR, "Scalable configurations are not allowed in ADTS\n");
return AVERROR_INVALIDDATA;
}
if (get_bits(&gb, 1)) {
av_log(s, AV_LOG_ERROR, "Extension flag is not allowed in ADTS\n");
return AVERROR_INVALIDDATA;
}
if (!adts->channel_conf) {
init_put_bits(&pb, adts->pce_data, MAX_PCE_SIZE);
put_bits(&pb, 3, 5); //ID_PCE
adts->pce_size = (ff_copy_pce_data(&pb, &gb) + 3) / 8;
flush_put_bits(&pb);
}
adts->write_adts = 1;
return 0;
}
static int adts_init(AVFormatContext *s)
{
ADTSContext *adts = s->priv_data;
AVCodecParameters *par = s->streams[0]->codecpar;
if (par->codec_id != AV_CODEC_ID_AAC) {
av_log(s, AV_LOG_ERROR, "Only AAC streams can be muxed by the ADTS muxer\n");
return AVERROR(EINVAL);
}
if (par->extradata_size > 0)
return adts_decode_extradata(s, adts, par->extradata,
par->extradata_size);
return 0;
}
static int adts_write_header(AVFormatContext *s)
{
ADTSContext *adts = s->priv_data;
if (adts->id3v2tag)
ff_id3v2_write_simple(s, 4, ID3v2_DEFAULT_MAGIC);
return 0;
}
static int adts_write_frame_header(AVFormatContext *s, ADTSContext *ctx,
uint8_t *buf, int size, int pce_size)
{
PutBitContext pb;
unsigned full_frame_size = (unsigned)ADTS_HEADER_SIZE + size + pce_size;
if (full_frame_size > ADTS_MAX_FRAME_BYTES) {
av_log(s, AV_LOG_ERROR, "frame size too large: %u (max %d)\n",
full_frame_size, ADTS_MAX_FRAME_BYTES);
return AVERROR_INVALIDDATA;
}
init_put_bits(&pb, buf, ADTS_HEADER_SIZE);
/* adts_fixed_header */
put_bits(&pb, 12, 0xfff); /* syncword */
put_bits(&pb, 1, ctx->mpeg_id); /* ID */
put_bits(&pb, 2, 0); /* layer */
put_bits(&pb, 1, 1); /* protection_absent */
put_bits(&pb, 2, ctx->objecttype); /* profile_objecttype */
put_bits(&pb, 4, ctx->sample_rate_index);
put_bits(&pb, 1, 0); /* private_bit */
put_bits(&pb, 3, ctx->channel_conf); /* channel_configuration */
put_bits(&pb, 1, 0); /* original_copy */
put_bits(&pb, 1, 0); /* home */
/* adts_variable_header */
put_bits(&pb, 1, 0); /* copyright_identification_bit */
put_bits(&pb, 1, 0); /* copyright_identification_start */
put_bits(&pb, 13, full_frame_size); /* aac_frame_length */
put_bits(&pb, 11, 0x7ff); /* adts_buffer_fullness */
put_bits(&pb, 2, 0); /* number_of_raw_data_blocks_in_frame */
flush_put_bits(&pb);
return 0;
}
static int adts_write_packet(AVFormatContext *s, AVPacket *pkt)
{
ADTSContext *adts = s->priv_data;
AVCodecParameters *par = s->streams[0]->codecpar;
AVIOContext *pb = s->pb;
uint8_t buf[ADTS_HEADER_SIZE];
if (!pkt->size)
return 0;
if (!par->extradata_size) {
uint8_t *side_data;
size_t side_data_size;
int ret;
side_data = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
&side_data_size);
if (side_data_size) {
ret = adts_decode_extradata(s, adts, side_data, side_data_size);
if (ret < 0)
return ret;
ret = ff_alloc_extradata(par, side_data_size);
if (ret < 0)
return ret;
memcpy(par->extradata, side_data, side_data_size);
}
}
if (adts->write_adts) {
int err = adts_write_frame_header(s, adts, buf, pkt->size,
adts->pce_size);
if (err < 0)
return err;
avio_write(pb, buf, ADTS_HEADER_SIZE);
if (adts->pce_size) {
avio_write(pb, adts->pce_data, adts->pce_size);
adts->pce_size = 0;
}
}
avio_write(pb, pkt->data, pkt->size);
return 0;
}
static int adts_write_trailer(AVFormatContext *s)
{
ADTSContext *adts = s->priv_data;
if (adts->apetag)
ff_ape_write_tag(s);
return 0;
}
#define ENC AV_OPT_FLAG_ENCODING_PARAM
#define OFFSET(obj) offsetof(ADTSContext, obj)
static const AVOption options[] = {
{ "write_id3v2", "Enable ID3v2 tag writing", OFFSET(id3v2tag), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, ENC},
{ "write_apetag", "Enable APE tag writing", OFFSET(apetag), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, ENC},
{ "write_mpeg2", "Set MPEG version to MPEG-2", OFFSET(mpeg_id), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, ENC},
{ NULL },
};
static const AVClass adts_muxer_class = {
.class_name = "ADTS muxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
const FFOutputFormat ff_adts_muxer = {
.p.name = "adts",
.p.long_name = NULL_IF_CONFIG_SMALL("ADTS AAC (Advanced Audio Coding)"),
.p.mime_type = "audio/aac",
.p.extensions = "aac,adts",
.priv_data_size = sizeof(ADTSContext),
.p.audio_codec = AV_CODEC_ID_AAC,
.p.video_codec = AV_CODEC_ID_NONE,
.p.subtitle_codec = AV_CODEC_ID_NONE,
.flags_internal = FF_OFMT_FLAG_MAX_ONE_OF_EACH,
.init = adts_init,
.write_header = adts_write_header,
.write_packet = adts_write_packet,
.write_trailer = adts_write_trailer,
.p.priv_class = &adts_muxer_class,
.p.flags = AVFMT_NOTIMESTAMPS,
};